<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 添加商品表单区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!-- tabs标签页区域 -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cascaderProp"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyForm" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyForm" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 图片上传的api后台接口 -->
            <el-upload
              action="https://www.liulongbin.top:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="picSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="addBtn" @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="imgPreDialogVisible" width="50%">
      <img :src="ImgPreviewPath" class="imgPreview" />
    </el-dialog>
  </div>
</template>
<script>
//引入lodash模块(用于数据深拷贝)
import _ from "lodash";
export default {
  data() {
    return {
      // 步骤条的激活节点控制
      activeIndex: "0",
      //添加商品表单
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_number: 0,
        goods_weight: 0,
        // 级联选择器选中的数据
        goods_cat: [],
        // 图片数组、
        pics: [],
        // 商品介绍
        goods_introduce: "",
        attrs: []
      },
      //添加商品表单验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "请选择商品分类", trigger: "blur" }
        ]
      },
      //商品分类列表
      cateList: [],
      //   级联选择器配置属性
      cascaderProp: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name"
      },
      // 动态参数列表
      manyForm: [],
      // 静态属性列表
      onlyForm: [],
      //图片上传的header请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      //控制预览图片对话框的显示和隐藏
      imgPreDialogVisible: false,
      //图片预览路径
      ImgPreviewPath: ""
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败！");

      this.cateList = res.data;
    },
    // 级联选择器的值发生改变时
    handleChange() {
      //判断是否选择的为三级分类
      if (this.addForm.goods_cat.length !== 3) {
        return (this.addForm.goods_cat = []);
      }
    },
    // 当页签切换前触发
    beforeTabLeave(activeName, oldActiveName) {
      // console.log(activeName);
      // console.log(oldActiveName);
      // 如果当前在商品基本信息页面并且没有选择三级分类 就阻止页签跳转并提示用户
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择商品分类！");
        return false;
      }
    },
    // 标签页点击事件
    async tabClicked() {
      // 点击动态参数面板
      if (this.activeIndex === "1") {
        // 获取动态参数列表
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" }
          }
        );
        // 获取失败
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
        // 将返回值的attr_vals转化为数组
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });
        this.manyForm = res.data;
      } else if (this.activeIndex === "2") {
        //点击静态属性面板
        // 获取动态参数列表
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" }
          }
        );
        // 获取失败
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
        this.onlyForm = res.data;
        console.log(this.onlyForm);
      }
    },
    //图片预览事件
    handlePreview(file) {
      console.log(file);

      this.ImgPreviewPath = file.response.data.url;
      console.log(this.ImgPreviewPath);

      this.imgPreDialogVisible = true;
    },
    //图片移除事件
    handleRemove(res) {
      //拿到移除图片的文件路径
      const filsPath = res.response.data.tmp_path;
      //找到路径在pics数组中的索引值
      const i = this.addForm.pics.findIndex(val => val.pic == filsPath);
      //调用数据的splice方法移除该图片信息
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm.pics);
    },
    //图片上传成功事件
    picSuccess(res) {
      //拼接一个图片信息
      const Apic = { pic: res.data.tmp_path };
      //将图片放入pics数组中
      this.addForm.pics.push(Apic);
    },
    //添加商品
    addGoods() {
      this.$refs.addFormRef.validate(async flag => {
        if (!flag) return this.$message.error("请完善必填的表单信息");

        //发起请求 添加商品
        //处理数据
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");
        //处理动态参数
        this.manyForm.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ")
          };
          this.addForm.attrs.push(newInfo);
        });
        //处理静态属性
        this.onlyForm.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        // 发起请求添加商品 商品名称必须是唯一的
        const { data: res } = await this.$http.post(`goods`, form);

        if (res.meta.status !== 201) return this.$message.error(res.meta.msg);

        this.$message.success("添加商品成功");
        this.$router.push("/goods");
      });
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  }
};
</script>
<style scoped lang="less">
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.imgPreview {
  width: 100%;
}
.addBtn {
  margin-top: 15px;
}
</style>